She's an American artist and musician. She's also the daughter of the founder of the Church of Satan, and was the high priestess of the church between 1985 and 1990.

After leaving the Church of Satan, she renounced LaVeyan Satanism and started to follow Sethianism, which is linked to the ancient Egyptian god Seth. In a 2012 interview with Vice, she said she decided everything her father had taught her was a lie "due to the intervention of the god Seth." In 2002, she was made high priestess of the Temple of Set.

It's mainly appearance-based, but that hasn't stopped the comparisons between the two. Some say Swift is a reincarnation (which doesn't really make sense because both of them are still alive), some say she is a clone (also not likely), and others think it's just a crazy coincidence (pretty likely).

Fans are also looking for satanic, Illuminati symbols in Swift's music videos.

The conspiracy theory is that Swift was taken and replaced by the Illuminati with a clone of LaVey, who is apparently a member of the secretive cult. Of course, the counter argument to this could be that Swift is, y'know, ageing.